High-spin bands in {sup 80}Kr

High-spin states in {sup 80}Kr were studied using the {sup 65}Cu({sup 18}O,{ital p}2{ital n}) reaction at 65 MeV. Prompt {gamma}-{gamma} coincidences were measured using the Pitt-FSU detector array with nine high-purity Compton-suppressed Ge detectors and a 28-element Bismuth Germanate multiplicity filter. The previous level scheme has been extended by 16 new states up to spins and parities of 20{sup +} and (19{sup {minus}}). The known band crossing in the positive-parity yrast band of {sup 80}Kr near {h_bar}{omega}{approx}0.5 MeV may be due to a {ital g}{sub 9/2} neutron alignment, rather than a {ital g}{sub 9/2} proton alignment as had been previously thought, based on the predicted oblate shape by Hartree-Fock-Bogolyubov calculations. No evidence was found for a second crossing in the yrast sequence up to {h_bar}{omega}=0.9 MeV. The new extension of the ground-state band through nonyrast states points to another band crossing at {h_bar}{omega}{approx}0.62 MeV which may be caused by a {ital g}{sub 9/2} proton alignment. A new negative-parity high-spin band shows that rotational bands do form at excitations above the strongly mixed low-spin levels as in the isotone {sup 82}Sr.